// doT.js
// 2011, Laura Doktorova, https://github.com/olado/doT
// Licensed under the MIT license.

(function () {
  "use strict";

  var doT = {
    version: '1.0.17',
    templateSettings: {
      evaluate: /\{\{([\s\S]+?\}?)\}\}/g,
      interpolate: /\{\{=([\s\S]+?)\}\}/g,
      encode: /\{\{!([\s\S]+?)\}\}/g,
      use: /\{\{#([\s\S]+?)\}\}/g,
      useParams: /(^|[^\w$])def(?:\.|\[[\'\"])([\w$\.]+)(?:[\'\"]\])?\s*\:\s*([\w$\.]+|\"[^\"]+\"|\'[^\']+\'|\{[^\}]+\})/g,
      define: /\{\{##\s*([\w\.$]+)\s*(\:|=)([\s\S]+?)#\}\}/g,
      defineParams: /^\s*([\w$]+):([\s\S]+)/,
      conditional: /\{\{\?(\?)?\s*([\s\S]*?)\s*\}\}/g,
      iterate: /\{\{~\s*(?:\}\}|([\s\S]+?)\s*\:\s*([\w$]+)\s*(?:\:\s*([\w$]+))?\s*\}\})/g,
      varname: 'it',
      strip: true,
      append: true,
      selfcontained: false
    },
    template: undefined, //fn, compile template
    compile: undefined  //fn, for express
  };

  if (typeof module !== 'undefined' && module.exports) {
    module.exports = doT;
  } else if (typeof define === 'function' && define.amd) {
    define(function () {
      return doT;
    });
  } else {
    (function () {
      return this || (0, eval)('this');
    }()).doT = doT;
  }

  function encodeHTMLSource() {
    var encodeHTMLRules = {"&": "&#38;", "<": "&#60;", ">": "&#62;", '"': '&#34;', "'": '&#39;', "/": '&#47;'},
      matchHTML = /&(?!#?\w+;)|<|>|"|'|\//g;
    return function () {
      return this ? this.replace(matchHTML, function (m) {
        return encodeHTMLRules[m] || m;
      }) : this;
    };
  }

  String.prototype.encodeHTML = encodeHTMLSource();

  var startend = {
    append: {start: "'+(", end: ")+'", endencode: "||'').toString().encodeHTML()+'"},
    split: {start: "';out+=(", end: ");out+='", endencode: "||'').toString().encodeHTML();out+='"}
  }, skip = /$^/;

  function resolveDefs(c, block, def) {
    return ((typeof block === 'string') ? block : block.toString())
      .replace(c.define || skip, function (m, code, assign, value) {
        if (code.indexOf('def.') === 0) {
          code = code.substring(4);
        }
        if (!(code in def)) {
          if (assign === ':') {
            if (c.defineParams) value.replace(c.defineParams, function (m, param, v) {
              def[code] = {arg: param, text: v};
            });
            if (!(code in def)) def[code] = value;
          } else {
            new Function("def", "def['" + code + "']=" + value)(def);
          }
        }
        return '';
      })
      .replace(c.use || skip, function (m, code) {
        if (c.useParams) code = code.replace(c.useParams, function (m, s, d, param) {
          if (def[d] && def[d].arg && param) {
            var rw = (d + ":" + param).replace(/'|\\/g, '_');
            def.__exp = def.__exp || {};
            def.__exp[rw] = def[d].text.replace(new RegExp("(^|[^\\w$])" + def[d].arg + "([^\\w$])", "g"), "$1" + param + "$2");
            return s + "def.__exp['" + rw + "']";
          }
        });
        var v = new Function("def", "return " + code)(def);
        return v ? resolveDefs(c, v, def) : v;
      });
  }

  function unescape(code) {
    return code.replace(/\\('|\\)/g, "$1").replace(/[\r\t\n]/g, ' ');
  }

  doT.template = function (tmpl, c, def) {
    c = c || doT.templateSettings;
    var cse = c.append ? startend.append : startend.split, needhtmlencode, sid = 0, indv,
      str = (c.use || c.define) ? resolveDefs(c, tmpl, def || {}) : tmpl;

    str = ("var out='" + (c.strip ? str.replace(/(^|\r|\n)\t* +| +\t*(\r|\n|$)/g, ' ')
        .replace(/\r|\n|\t|\/\*[\s\S]*?\*\//g, '') : str)
        .replace(/'|\\/g, '\\$&')
        .replace(c.interpolate || skip, function (m, code) {
          return cse.start + unescape(code) + cse.end;
        })
        .replace(c.encode || skip, function (m, code) {
          needhtmlencode = true;
          return cse.start + unescape(code) + cse.endencode;
        })
        .replace(c.conditional || skip, function (m, elsecase, code) {
          return elsecase ?
            (code ? "';}else if(" + unescape(code) + "){out+='" : "';}else{out+='") :
            (code ? "';if(" + unescape(code) + "){out+='" : "';}out+='");
        })
        .replace(c.iterate || skip, function (m, iterate, vname, iname) {
          if (!iterate) return "';} } out+='";
          sid += 1;
          indv = iname || "i" + sid;
          iterate = unescape(iterate);
          return "';var arr" + sid + "=" + iterate + ";if(arr" + sid + "){var " + vname + "," + indv + "=-1,l" + sid + "=arr" + sid + ".length-1;while(" + indv + "<l" + sid + "){"
            + vname + "=arr" + sid + "[" + indv + "+=1];out+='";
        })
        .replace(c.evaluate || skip, function (m, code) {
          return "';" + unescape(code) + "out+='";
        })
      + "';return out;")
      .replace(/\n/g, '\\n').replace(/\t/g, '\\t').replace(/\r/g, '\\r')
      .replace(/(\s|;|\}|^|\{)out\+='';/g, '$1').replace(/\+''/g, '')
      .replace(/(\s|;|\}|^|\{)out\+=''\+/g, '$1out+=');

    if (needhtmlencode && c.selfcontained) {
      str = "String.prototype.encodeHTML=(" + encodeHTMLSource.toString() + "());" + str;
    }
    try {
      return new Function(c.varname, str);
    } catch (e) {
      if (typeof console !== 'undefined') console.log("Could not create a template function: " + str);
      throw e;
    }
  };

  doT.compile = function (tmpl, def) {
    return doT.template(tmpl, null, def);
  };
}());
